parallel/bin/worker

#!/usr/bin/env php
<?php

use Amp\Parallel\Sync;
use Amp\Parallel\Worker;

// Doesn't exist in phpdbg...
if (\function_exists('cli_set_process_title')) {
    @cli_set_process_title('amp-worker');
}

// Redirect all output written using echo, print, printf, etc. to STDERR.
ob_start(function ($data) {
    fwrite(STDERR, $data);
    return '';
}, 1, PHP_OUTPUT_HANDLER_CLEANABLE | PHP_OUTPUT_HANDLER_FLUSHABLE);

(function () {
    $paths = [
        dirname(__DIR__, 3) . '/autoload.php',
        dirname(__DIR__) . '/vendor/autoload.php',
    ];

    $autoloadPath = null;
    foreach ($paths as $path) {
        if (file_exists($path)) {
            $autoloadPath = $path;
            break;
        }
    }

    if ($autoloadPath === null) {
        fwrite(STDERR, 'Could not locate autoload.php.');
        exit(1);
    }

    require $autoloadPath;
})();

Amp\Loop::run(function () {
    $channel = new Sync\ChannelledSocket(STDIN, STDOUT);
    $environment = new Worker\BasicEnvironment;
    $runner = new Worker\Internal\TaskRunner($channel, $environment);

    try {
        $result = new Sync\Internal\ExitSuccess(yield $runner->run());
    } catch (Sync\ChannelException $exception) {
        return; // Parent context died, simply exit.
    } catch (Throwable $exception) {
        $result = new Sync\Internal\ExitFailure($exception);
    }

    $channel->send($result); // Do not yield sending result on channel, process does not care if result arrives.
});